proterozoic eon

Noun proterozoic eon has 1 sense

• proterozoic eon(n = noun.time) proterozoic, proterozoic aeon - from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms;
is a part of precambrian, precambrian aeon, precambrian eon, precambrian period
is a kind of aeon, eon